[sdiy] Unknown VCF PCB

[Colin f]

> -----Original Message-----
> From: synth-diy-bounces at dropmix.xs4all.nl 
> [mailto:synth-diy-bounces at dropmix.xs4all.nl] On Behalf Of 
> Phil Macphail
> Sent: 07 July 2014 08:44
> Subject: Re: [sdiy] Unknown VCF PCB

> The SSM2045 was in an 18-pin package, but it would have been 
> a bit of a waste to use it for a SVF.

Actually you can't use an SSM2045 for anything but a SVF - it's a dual
series low pass SVF plus VCA on a chip.
That board layout looks very much like it might have been based on the
Maplin SSM2045 VCA/VCO/VCF board they sold in the late 80s, and documented
in Electronics magazine.
The only difference is a quad op-amp instead of the dual op-amp.
I'd check the pinout against the 2045 datasheet.

Cheers,
Colin f